It has a turned down bolt with a tiny crown like the one on the reciever on the back of the bolt, so I think it's original. I'll try and post pick today, I'm mnot very good at such things.
Oh, ther was no brass disk on the stock at all, I paid $160 for it.
After further review the number on the bolt matches the last three on the serial number, so it's the original bolt.
What baffles me is that there are no marking where the original rear sight was, may be someone put a new barrel on it, but I don't see the point in making an exact replica of the original barrel unless the rifle was in original condition.